Advances in Unconventional Computing by Andrew Adamatzky

Author:Andrew Adamatzky
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

17.3 The PEPS Effect in Unmodified Semiconductors

Several different systems have been already described with regard to the PEPS effect occurrence in unmodified semiconductors. Nonetheless, in such cases it is easier to observe the switching effect upon the change in the electrode polarization, rather than the change in the incident light wavelength. The switching following the latter is also possible, but it requires the presence of trap states within the band gap that efficiently exchange charge carriers with electrolyte. The photocurrent switching effect was observed for unmodified oxide semiconductors such as bismuth orthovanadate [30, 31], BiLaVO solid solutions (x between 0.23 and 0.93) [13], lead molybdate, [11] V-VI-VII semiconductors like bismuth oxyiodide, [6, 9] bismuth oxynitrate [30] and antimony sulfoiodide [10] as well as cadmium sulphide (CdS) [26, 31] and lead sulphide [32].

Fig. 17.3The photoelectrochemistry measurements results for BiOI. The linear sweep voltammetry of BiOI photoelectrode under pulsed 450 nm irradiation (a). The photocurrent action spectra at different photoelectrode potentials in 10 mM KI equilibrated with air (b). The mechanisms of photocurrent generation: anodic (c) and cathodic (d). NHE stands for Normal Hydrogen Electrode

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